townsend



my 1, 1924. 1,499,426 J. E. TOWNSEND SAND CUTTING AND SCREENING MACHINEFiled May l2, 192C] 8 Sheets-Sheet 2 J1 /5 f /66/74/6 64 July 1 1924.

J. S. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2, 1920 8Sheets-Sheet 5 July 1 Vv1924.

J. S. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2. 1920 8Sheets-Sheet 4 .IlflH d..

.July 1 1924. 1,499,426

J. S. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2. 1920 8Sheets-Sheet 5 July 1 1924. 9 1,499,426

.,l.` S. TOWNSEND SAND CUTTNG AND SCREENING MACHINE I Filed May 12 19208 Sheets-Sheet 6 July 1 1924.

J. s. TOWNSEND SAND CUTTING AND SCREENING' MACHINE Filed May 12, 1920 8Sheets-Sheet '7 July l 1924. 1,499,426

J. s. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May 12. 1920 8Sheets-Sheet E Patanted July l; i924 UNITED STATE P EENT FFECE.

.TOEN S. TOWNSEND, 0F HARVEY, ILLINGIS, SSIGNR T COEPBATIGN, 0F HARVEY,ILLINQIS, A. OBATIOE 33? LHS.

5.5m) comma um scum@ Mcm@ To all' 'whom it may concern:

Be it known that I, JOHN S. TOWNSEND, a` citizon of the United States,residing at Harvey., in the county of Cook and Stale of Illinois. haveinvented a coi-tain new :incl useful im rovemmit Sand Cutiiig :md Seremig Aziirliirw, of which the following is si s 3o fir-orion. Y l

IL is well und; @muil m the foundry lrt that after oasting has been done`im a foundry .find the oastin and flasks aiierefor are removed, thefoun ry room is leftin a considerably rliszordoiod state as regards thelmolding;h sand in that it is in all sorts of shopos did silos ind llaarit-foso pieces of casting; and olhoi' mai-o iai sii-oli Wfflga pleitosof broken cores, i-oils, amd. mixed with if., and tlm?, 'bom'e moldingcan italie piace the next; day this; sami luis o ne cleaned of thisofuse, wei flown. anni thor nughly x'nixeil and aeratad or cui) :mailmii:

`in convcniont piles. The objoct oi" iii in; `volition is to piwhvide a.machine piefrebly selfproxallod which can be driven thru the foundry toautomatisally romovo imm it by screaming all refusa maeriel, tliooiglilymix it after ii'. im?, been empeiofi im finally deliver it in ow alonglao foundry floor in condition to oo ro-used in he further making ofcastings,

Tha invention consists in a machine for accomplishing this objaot*willich is a seifcontained imcliine in that it can be controlled by :1Single opomtoi Tiding upon it, and pass thru the foundry tog pfiform allof the ilosii'od functions?, Molo piaimllaily the invention consists innovffl lemons in the unitary mnoliire for poii'l'aiixiirig oxwli of :isepan-aio olimoiiu'y iiiihiim {mier} g; intr] tho oon'lplef opoi'aximiof flu mili-o 11mA chino. AS ffii@ izificliiiiia'is qui@ romplioziml as:i wimlor` ounininii'ig ronny (livisionrl nul separato ports, lla@fifuimvo of omolty will be more YFully sol foitliiii lli@ spmiiicution"and claimirolziting; to ouch Suction fr part of the), machine.

Rofoi'iing lo the eight sheets, of Lli'uwingi in wliioh lio samormmeinlsrepresent the somo paris thruout lio sovfz'ol lows,

Figure l, is zi Sido imi nl' :i roiiiplo'or11:` chime illustrating' liisinw-mimi in iis` prV ferlod 'oim.

taken from the mai-yi, o. he right hand end of E gur L Figuie ahorizontal plan View partly in Section aoioss Figure L opproxk matelyius bolow sie sommi. v'

Figura iS Sile Elev' tion correopoiing to Figure l init largely.' inSrL-@Lion lo man? of the parle a Figui@ detail View of tho diferfentilgearmecimnislu viewd in connection with tho {rive for tlm tractionwheel.

Fig-uio 6 is a vertirzil 23nd View la. soci-ion, hilfen at approximatelythe lim of Figure l.

Figue l' is an and viow loolaisif the imola of the miic-hina, l n ulm'line in i'iofst, of ill@ 521ml soan omi ifi@ olriyimg wheol.

Figaro 5 u front .viaw of time mzwiino which fue machine piovided withelectric,"

energy as iL moves about lie foimrlry floor. Figue i0 o plan View o aicom shown in Seotiol in the @fight hand end of Figure 11. Y Figure l1 adtail viow largely ,in sei:- tion ol" a frioroii aiuta-,li and Worm goordrive times-@fon lle sume :ipeaying: atopigroximately the Center ofJigin'o the owar left band corner of the rotating semen. Y

Tho oi'iire iiiogzlezmism constituting lis iii.- enioii is mounted upono horizontal 'i-mno coiisiissf" mimiirily of *um oppositsly flis posed@i il ifim:i`ri.a"-,is iti como wl sit ilu front of tigo :olii o Fiji' nVoli@ ihn Iiiifidlo my :i i plooi' anni an the regali l; u u

,Rigixilly ,zigniiofl w nml. mili m opposiic sidi of the lower pol-wm o!ing 2O are sl, flo 2 A WliQQlS joui-ir ii. Dopenriiog from wastingspaced zlpzir umso-lugs 2T l is loci-nml zi Yerionlly vof-kaf" volwioiii'nfilorl on :i pin lill "USF" 1 piume only and so iiimmiwl inonli-i 'allow the rear wheels 32 to adjust themselves to irre laritiesin the surface of the floor travele These wheels 32 are located one ateach end of the yoke 28 and are supported thereon by the usual knucklemounting, common in automobiles, viz, each. wheel 32 is journaled on ahorizontal shaft 34 projecting from a block 36, itself carried bv a verihorizontal tical shaft `38 ournaled in space bearings 40 on t e yoke 28.

The up er ends of these shafts 38 are also supporte at their upper endsby brackets 42 extending from' the yoke 28. As in common automobilepractice, eac shaft 38 has projecting from it a. horizontal lever arm 44and these are attached togetherby a connecting rod 46 so that the wheels32 must move in unison.

The shaft 38 which is furthest from the operators station hereafterdescribed, is also provided with another horizontally project ing leverarm 48 to which is pivotally' connected a connecting rod 50 running backacross the machine. The opposite end of this rod 50 is pivoted to alever arm 52 projecting from a rotatable vertical shaft 54 )ournaled ina casting mechanism 56 secured to the adjacent channel iron 16.Horizontally projecting from the upper end of this Shaft 54 above thecastin 56 is an operators steering lever 58 provi ed with the usuallocking mechanism 60 engagin a star wheel 62 of ordinary construction. Tis lever 58 is located within easy reach'of the hand of the operator whostands u on a step 64 supported on the side of t e machine by anysuitable means, as for instance, the angles 66. It is obvious that theoperator standing on this platform 64, which will be 'frequentlyreferred to as theo rators station, can by rocking lever 58 bac ward andforward in a lane so move the lever mecha nism described that the rearor steering wheels 32 are angularly moved with refer ence to the yoke28, thus effecting steering ofthe machine in the ordinary way. The lever50 is of siicha length and the connections are sufficiently loose sothat the yoke 28 and the wheels 32 can rock up and down in a verticallane sutliciently to allow for irregularities in the floor or groundpassed over b the machine without destroying the control'of the shaft 54and consequently the handle lever 58 on the wheels 32 in their differentvertic positions.

Rigidly mounted on the hub of cach wheel 26 is a gear wheel 68 meshingwith a pinion 70. One of these pinions'i's carried on a apart l shaft 71and the other pinion is mounted on an op itely disposed aligned shaft72, the tw ing connected into a. differential meiihanism 74 shown indetail in Figures 5 and 7 but of. standard commercial construction andtherefore not described in specific detail. Any other standarddifferential mechanism for this purpose may be used Without departingfrom the invention.

This differential 74 carries the usual exter- -screws 84. These bracketmembers 83 just described, as clearly shown in Figure 7, also affordbearin supports 86 in which the shafts 71 and g2 are journaled at theirinner ends.

On the opposite end ofthe quill from pinion 78 is a sprocket wheel 88over which passes a sprocket chain 9.0 leading to the rear of themachine Where it also passes over another sprocket wheel 92. Thissprocket wheel 92 is rigid on shaft 94 journaled in four separatebrackets or bearing frames 95, 96, 97 and 98 rising from cross member22. This shaft 94 is selectively driven at two speeds forward and onespeed backward b an electric motor 100 carried on a suitab e bracket orplatform 102 projecting from cross member 22. The connection between themotor 100 and Ashaft 94, permitting this speed and direction changing isas follows Motor 100 carries pinion 104 which drives gear 106 carried ona short shaft 108 journale in supports v95 and 96. Short shaft 108carries a pinion 110 meshing with gear 112 on a shaft 114 carried in allfour of the brackets 95`t`o 98, heretofore referred to.

0n this shaft 114 and between supports 97 and 98 is mounted a doubleclutch 116- 116. Between the members 115 and 116 which in the drawingsrepresent standard parts of a commercial clutch mechanism of this typeis the usual reciprocable double cone 118 shiftable backward and forwardin the ordinary manner-by a lever 120 convenient to the operator whenstanding on the. operators platform 64. As will be described, each ofthe members 115 and 116 has a train of gearing attached to it, and theoperator in the usual manner selectively uses the desired one of thesesets of gearing by properly shifting the lever 120 to correspondinglyshift the cone 118.

Clutch member 116 is operatively con nected with the gear 120 meshingwith the gear 122 on shaft 94. When the parts are thrown to pro erposition so thattho motor 100 operates tliis train of gears thru clutchmember 116, the wheels 26 are driven in a clockwise direction as viewedin Figure 1, and the machine moves what is herein designated asrearwardly to draw the sand cutting and elevating mechanism away fromthe work. This train of gears 120 and 122, is in the particular casehere illustrated so proportioned that the machine moves relatively fastin this direction, thisin view izoI of the fact that no work sand pile.v.Clutch member 115 is operatively con nected to pinion 124 meshing withthe gear 126 on shaft 128 journaled inA supports 97 and 98. This shaft128 carries two pinions 129 and 130 of different sizes meshingrespectively with gears 131 and `132 freely journalcd 0n shaft 94.

Slidable lengthwise of shaft 94 between these gears 131 and 132 whichare, by the way, of different siies,l is a clutch mechanism 134shiftable by hand lever 136 under the control of the operator to causesaid clutch 134 to operatively engage either the gear 131 or the gear132. I

In actual practice the two trains of gears 13G- 132 and 129-131 are'so-proportioned that when one set of gears is in use the s eed of themachine forward, viz, tothe leflt, as viewed in Fi ure 1, is about isbeing done on the twice as fast as when the ot er set of gears is inmesh. This allows the operator, by properly manipulating lever 136 tothus selectively vary the forwardworking speed ofthe machine to takecare' of varying sand conditions on the floor or in the 'foundry Wherework is being done. v

' The motor 100 is su ledwith electric current-from any suitagltl sourcedelivered to it thru4 a supply cable 13S-connected at its end outsidethe figures shown to a lined oint source of energy-this cable 138 beingdivided on the machine into separate wires 140, leading to the motor 100thru any sort of electric control mechanism ordinarily required inelectric .motora the same no t enteringinto` Vthis4 invention andtherefore not ,shown in'detail. In iorder to keep the cable138reasonably tight in all positions of the machine in the foundry whereit is working and thus avoid tangling of the cable vwith the machine1the mechanism shown at the top of Figure 2-and in detail in Figure 9keeping the slack of the cable reeled up. The mechanism for doing thiscomprises a drum or reel .142 mounted on a shaft 144 journaleduinsuitable bearings 146 carried by the frame mechanism. This sha-ft 144 isrotated byv a sprocket chain-drive 148 from shaft 94 which it will beremembered only rotates when 'the macl moved. over the floor.

The detailed mechanism driving sprocket chain 148 which performs itswork isof considerable importanceg 1- The upper portion of the chainpasses over a sprocket wheel 150 freely' rotatable` on shaft 1441butpressed into 4frictional engagement with a v disk 152, rigid on shaft144 thru the aetionzfof a. compression spring 154. The disk'1'52 carrieson its face adjacent to` the wheel 150 cork plugs 156 which afford africtional yet yielding'eontact with the face ofthe wheel 150 so that isprovided for constantly,

.struction having oppositely fthe usual screen material line is 'beingwheel 150 can rotate angularly with reference to the disk 132 but isretarded by the frictional engagement caused by th-e spring 154. Theresult of this construction is that assuming that chain 148 isoperatively driven by shaft. 94 the chain will cause wheel 150 to rotatedisk 152 and thus wind up cable 138 just as long as there is slack cableto be so wound, but that when this operation is completed furtherrotation of shaft 94 merely causes wheel 150 to slip on disk 152 andthus prevent breaking injury to cable 128. This also allows for theunwinding ofthe cable 128 off from `the drum 142 whenever the machine isrunningin the right direction for this. Under this condition disk 152and the wheel 150 actually rotate in opposite directions.

Sprocketchain 148 is operated and connected to shaft 94 by passing over'a sprocket .wheel 158 which is detachably connectible to shaft 94- thrua latch member 160 which is also when rotated thru 180 from theoperating position shown in Figure-2, a. crank handle by which theoperator may rotate s 4arocket wheel 158 to independently manipu atedrum 142 without reference to the rotation to shaft 94. This latchmember crank `handle 160 is for this purpose L-shaped, as shown, and is'pivoted to one side of the sprocket wheel 158 at 1 62 so that wh`en themember 160 is rotated in a clockwise direction thru 180 from theposition shown in Figure 2, the hand grip member 160 may be readilytaken hold of by the operator for operation as desired.

Tho it forms n o part of this invention it may be Statedthat the currentdelivered by cable 138 reaches wires 140 thru three controller-rings 164in continuous metallic contact 4with the usual controller fingers 166clearly shown in Figure 2.

The sand screening or riddling mechanism is a metallic frame of standardcondisposed metallic rings 168 and 170 spaced apart by connesting rods172 between which is mounted 174. The forward end4 of this riddle ismounted on rollers 176 carried by the frame of the machine. The ring 168rotates upon these rollers. The rear 'ring 170 is carried by a suitablesaider 178 from a hub4 180 rigid upon a sha 182 journaled in thebearings184 formed at the upper end of member 97.

The right hand end of .shaft 182 carries aliand lever 200 under thecontrol of the operator. l 'properly mani.pulatinzig'V this lever theoperator can' cause theriddle to be rotated or remain at restasiledesires.

This lever 200 also simultaneously sets the elevating mechanism 1 to' belhereafter de-`V rotatable sweeping lblades I'or .ironmeii scribed, inoperation; This'letter o leration is accomplished thru the fact thatt ievshaft 190 carries a sprocket Wheel202 overwliieh over an'other s4rocket wheel -206 mounte on the main sistt208 whichdrives the elevatormechanism to'be hereafter de-A scribed. 4 f

Sliaft208 is journaled in suitable bearings 210 supported. on oppositesides, of

the Vframe inconnection withmemberV 18, heretofore described, Tanddiagonal braces' 212', rising from the side channel irons,

clearly shown in 'Fi ure V1.

i Rotatably'mounte on shaft 20S intermediate between the side m*embersvofv the frame 18 are two block bea1i1igs214', eleai'ly shown inFigurell; 'Slidablyni'ountedon opposite. sides of each one of theseblock bearings'is 'an elevator freine member-.216 made up of twoseparated parallel members connected by. s'p'acing`nienibers 218. Thisframe member 2,16 is nioval'ale z -lonvitudinailly of the bearing' blockthru 'tie agency of a rotatable 4screw 2 2() hearing at one. end"adjacent the block4 bearing and threaded thru a stationary In? 222 oiijaY rigidA cross member 224 of t i'rame.. By applying a wi'eiichito thenoncircular end 226 ofthe screw it inayc'be rotsted` in eitherdirection. thus"causii'ig-.they l b lockjb'earing and consequently'f theentire.

elevator frame to move 'toward-jor from* the bearing block; 214i f andconserieiitly the shaft 208, 'As there is 'one'ofji `ese-screws 220t'oieach side 'of the elevator fit-is '0badapted When'thesprocketfirflieelsf230 and;

' vious'4 that yby rotating both'gsc'r'ews Itho' enf tire. elevatorlwill be raised 4or lowered .with reference to the shaft 208.4 This isdone for the purpose of tigli'teningthe respective sprocket chains.22S-Which pass over sprc'iclwtV wheels '230r atithe top 'ot the elevatorand' 232 at the bottom of the elevator. The two sprocket chains .228-have suitably .'coniie'et= ed to them transverse'elevator buckets 234232 are rotated in a .clockwise direction," as viewed in Figures 1and-2,. tojserapeviip ma terial .at thebott-omfof tlie'eleva'todrarryit' fip" the outside or 'left hand side lof the elevator'and over tlietopof the.' sprocket wheels 2301at=a suliicient s 4eed to cause thecontents-of the buoletat' e-toptolbe dis- 4charged 4into the seree'nl'orriddleheretofoe described.

` ferred to,V are' 'carriediipon" -a horizontal ie elevator' Thesprocket-Wheels heretofore re-r end of the eleva-tor' frame; 'I Theshaft l l is of considerably greater length than the' Awidth of the mainelevator frame, viz: the

distance between the members 216,v4 This surplus length' of shaft "236'is occupied 'by' 242 well lrnownin the art so positioneda'nd arrangedthat' the blades on eacligset sweep l sa'iid or other materiel'engagedby themto-- Ward tlieoenter of tliedevice. into the'patli' of travel rof the fbuekets' 234 4so thatthe'.' buckets can take u the material.gathered bythe ironmenran -deliver'itinto the 'rid (lle.

lieelevator mechanism is positioned as -to lieifrht with reference ,to-tlie` floor or by being 1 'rocked singularly about ground tl'ieaxis 'ofshaft 2G81 This movement is'V of the elevator frame projecting.truniiions 244 ou.l each ofv Whicligi'sV journaled a 'gengated slot-248 thru which assesa vshaft-.2512) herl 246tlie result beingv that whenshaft 250 is rotated, as hereafter.-deseribecl,1 the" pinionforces reel;256mm travel: horizon- 4 tally over-the; pinion, -tlii'isreci'proz:ating in either direction desired;4 .the member [246,

and .conset]uently the elevator mechanism. The shaftiO isldriven-ineither'direction4 at 4the will' of: the operator, thru any s'uit4ablesort of ameeliaiiismoneformot which Thesliaft 2,50cari'ie's a Wormicov ica4

sleeve 4carries -a l .pair of oppositely disposed liioV I 'Y i ysproketchainrieelianisiii' 4278 to shaft i 114,lieretofoie described,-

when -the operator, lby mea-ns hereafter del rocks. the elevator.mechanism about "shaft .-so that rotation'pf shaft :114fcontinuouslyqrotates friction d1sh12i2- with thief,result thatfA 208as acenterand'.thns'jiiivethe iroiimeii e subseries dismiss mi sem-the suores desired; Y.

1,2j12and @elevator to '-properfworking posi-'j Y .tion adj scentgtovthe 'door' or :tojJ elevate them,

The special advanta e of using a friction drive between the resectivegears 272 and- 2@i and SH2 and 271 is to ermit slipping, thus preventingbreaking W en the elevator is moved to the limity of its stroke ineither direction as defined hy the length of the elot- 248 and also toallow for trouble in the event the operator attempts to raise theelevalor against obstructions on the loor in the path of the adjacentbucket 234.

The sleeve 268 and attached parts, here-- toforc. described. isreciprocated along the shaft 264 thru the lever and cam mechanism shownin Figure l0 and at the right hand end of Figure 1l. A. lever 280 isrigidly attached to a collar 282 rotatable on the sleeve 268 and heldagainst endwise movement thereon by a collar 284- held in place by a.pin 286. This collar is rotatable inside of a bearing 288. suitablysupported. Thru this bearing 288 is an elongated cam slot 290 thru whichpasses apin 292 entering collar 281V. From au inspection of the partsjust described it will be seen that b rocking the lever 28() andconsequenty partially rotating collar 282 the collar must travellengthwise-of itsell= a distance equal (ill to the length of a cam slotQ90, and*this forces the sleeve 268 to travel lengthwise an equaldistance (because the collar 282 bears on the collar 28e at one end andon the. dial; Ql at the other).

liever 280 is reciprocahle thru n connecting rod 29emanipnlated by ahand lever Y296 in easy reach oi the operator. In practice the operatortakes hold of this hand lever and holds it in the required position torengage disks 272 and 271. or E272 and Q as required to makethe move mentof the elevator he sires: The rest of the time he leaves the lever aloneand the frirtional engagement only between the disiis, heretoforedescribed. prevents siccidents.

ne important feature of the invention lo provide easy means for insuringvery shorl'fturns of the machine in passing over the foundry Hoor. Thisis accomplished by providing each driving Wheel 26 `with an independentbrake so that by applying the brake to one driving wheel. leaving theother free, the machine will turn very rapidly shout the brained wheel apivot. This hrahe mechanism consists of a pair of inderendent brake,shoes and 300. independenly operated by independent oottreadles Elliand T504 within easy reach of the operator. .ln carrying out the detailsof this device both brake shoes operate about the central axis of thecross shaft 306. This shaft is the operating member for brake shoe E298which is rigidly attached to it and is merely the pivotal axis for thebrakeshoe 300. Obviously treadle 304i is eonnected to lever 30S torotate the shaft 306 to move brake shoe 298. Similarly treadle 302 isconnected to drive brake shoe 300.

The body of the screen or riddle is enveloped on its opposite Sides bydirt retaining walls 310 and 312 terminating at their bottom in adownwardly and rearwardly extending chute 314 adapted lo direct sandpassing thru the riddle to the end of the chute into a pile midwaybetween the supporting Wheels of the machine.

Across the machine at a point below the riddle and leading to one sidethereof is a coarse material chute 316 adapted to receive coarsematerial which does not pass thru the riddle and carry it olf to theside of the machine. In the particular case illustrated in Figure 2 theend of this chute is detachably iosable by door 31.8 adapted to retainthis coarse material at the end of the chute until the operator is readyto remove it from the machine.

Operation The motor l0@ runs continuously in one direction. The operatorby properly manipulating the lever 120, as described, causes the entiremachine to travel backward 0r 1 orward as he desires. Before startingforward or while the machine is running extremely slow he can bymanipulating the lever llt change the speed. By manipulating lever Q00the operator causes the motor to operaie the screen and elevator. Byreversing this lever he stops these. orly manipulatingT the lever 29Sthe operator raises or lowers the elevator with reference to the floor,the parts being;` locked in desired position b v the Well known lockingraction of the Worm and gear Qlm. In addition to the foregoing the motorautomatically takes care of the drum 142 controlling the supply cablefor electricity' leading to the machine. ln addition the operator steersthe machine thru lever 58 and by using one or the other of the treadles30:9. and 3M facilitate turniing;r action.V The result of the foregoingis that the compact machine shown and de` scribed can he moved in anydirection. and do the Work required, with a maximum elliciehcy.

Havingr thus described my invention what I claim as new and desire tosecure by Letters Patent, is

l. In mechanism of the class described, a supporting frame, an elevatormechanism pivotallv mounted` near the top of the frame so that its lowerrnd can swing toward and from the frame. and a pair of rods on oppositesides of the elevator slidable approximately horizontally thru theframe, a rack on each rod, a shaft mounted in the frame having a pinionadjacent to cach rack, a power shaft adjacent to the first mentionedshaft, a reversible friction drive mechanism between the power shaft andthe first men- By propi tioned shaft, and means for :selectivelymovquently the mac me along the floor, variable i riddle carried* by thewhic in said friction drive mechanism to deter mlne in which directionthepower shaft shall move the first shaft and consequently the elevator,for the urposes set forth.

2. In mechanism o Ythe class described, a supporting frame, wheelssupported for movement over a foundr iloor, a rotatable riddle carriedby the me, an elevator pivotall mounted adjacent to the end ,of the ridde equipped with sand cutting means for athering sand -onto the elevatorfrom it is delivered to the riddle, a sin le motor carried on themachine, means which' said motor drives said riddle and said elevator,means by which said motor propels the su rting wheels andconsegearmechanisms between the motor and the wheel supporting mechanism by whichthe operator 1n a single o erator's station on the machine may vary edirection and-s of the machine, and means controlled by the operator ofthe machine at said station for starting and stopping, reversin tion andvarying the speed: of the machine, starting and stoplping the riddle andelevator for varying t e angularity of the eleva-- to 3. In mechanism ofthe class described, s suppertingeframe, wheelsA supported for movementover a found ame, an elevator tion, and varying the s floor, arotatablepivotally mounted adjacent to the end of the riddle equippedwith sand cutting means for atherin sand onto the elevator from whic itis elivered to the riddle, a si le motor carried on the machine, means ywhich said motor drives said riddle and said elevator, means by whichsaid motor propels the supporting wheels and consequently the machinealong the door, variable gear mechanisms between the motor and the wheelsupporting mechanism by which the operator in a single operators stationon the machine may vary the direction and s y of the machine, and meanscontrolled by the operator of the machine at saidY station for startingand stopping revel-sin the direcof t e machine, starting and stop ingriddle and elevator for varying t e angular-ity of the elevator, this in'combination with an electric supply cable leading from a fixed supportto peed the machine, and an automatic winding mechanism for thecabedriven' il); the machine, keepng the cable tiht in a positions of themachine within t cable.

In witness whereof, I have hereuntosubsgribed my name in they presenceofv two witn L o JOHN S. TOWNSEND. Witn:

Dwmm' B. Cmvn,

Arma Rossmann.

e length of the f

